Least number k such that k, k+n, k+2*n and k+3*n have the same number of divisors.

Terms

a(0) =242a(1) =213a(2) =3445a(3) =111a(4) =8718a(5) =5a(6) =2001a(7) =69a(8) =3526a(9) =299a(10) =1074a(11) =5a(12) =2222a(13) =537a(14) =9177a(15) =129a(16) =4114a(17) =5a(18) =8a(19) =598a(20) =7843a(21) =111a(22) =1235a(23) =10a(24) =2984a(25) =303a(26) =3538a(27) =417a(28) =987a(29) =7